Yup that is the secrete to using Proton ..... the Experimental will work most of the time but not always and you have to change the versions of Proton like Michel did in his post above .....
Something else I do is go to proton website and search for your game ..... then read all the comments and how they configured the game on their respective units ..... if you can match their specks or come close give it a try ..... paying attention especially to what GPU and drivers they are using .... copy and past their launcher in the appropriate box .....
The only way I could get my current game ( hunter: Call Of The Wild ) to play on my laptop was to run the following launcher in the Steam game .......
GAMEMODERUNEXEC="DXVK_ASYNC=1 DXVK_FRAME_RATE=30 DXVK_FILTER_DEVICE_NAME="1650"" PROTON_HIDE_NVIDIA_GPU=0 PROTON_ENABLE_NVAPI=1 VKD3D_CONFIG=dxr11 VKD3D_FEATURE_LEVEL=12_1 gamemoderun %command% /borderless
Do I understand what all that gibberish means ..... absolutely not ..... all I know is it worked ....... important thing is the line .....
DXVK_FILTER_DEVICE_NAME="1650""
And to use the correct manufacture either NVIDIA or AMD
That is my GPU model number and you can substitute your model number to see if it will work for you that's what I did ..... I have other launchers for different games saved in a doc folder .... be patient it can take quite a long time depending on how many folks have submitted their findings ......
Two other launchers that I use for different games .....
VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json %command%
And
Proton Expermental ....... gamemoderun %command% /borderless
Just some stuff I picked up with my limited experiences ......